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Please use this identifier to cite or link to this item: http://hdl.handle.net/1834/4006

Title: Caracterización y cronología del exoesqueleto en la centolla Lithodes santolla (Crustacea, Lithodidae) del Golfo San Jorge, Argentina.
Other Titles: Shell-condition and shell-age classification of the southern king crab Lithodes santolla in the San Jorge Gulf, Argentina.
Authors: Di Marco, E.J.
Theses advisor: Mallo, J.C.
Wyngaard, J.G.
ASFA Terms: Exoskeleton
Issue Date: 2002
Abstract: Southern king crab Lithodes santolla specimens were captured during INIDEP research cruises in the San Jorge Gulf (45 degree -47' S, 64 degree -68' W), Argentine Sea, in March, April, July and August 2001 and August 2002. In order to determine qualitative and quantitative characters related to the shell ageing, a macroscopic examination of specimens was performed. The main considered characters were: shell hardness, ventral shell coloration, necrosis development, merus meat content, kind of epibionts, abrasions length on coxa and maximum size of ventral necrosis. A hierarchical grouping from the qualitative characters was elaborated and associations among these characters were established. Thus, a key to discriminate the specimens in different groups was elaborated. At the same time, a multivariate analysis was carried out considering the quantitative characters and assessing its correspondence with the established qualitative groups. The associations established between both qualitative and quantitative characters allow to define different groups or 'shell conditions'. A chronological relation was established among the groups and a tentative age was assigned on each group. These studies will permit to orient the investigations of the population dynamic towards the analysis of the spatial-temporal variation of the 'relative ages' that compose the structure of the cohorts, with the purpose to establish more precise fishery management measures.Original Abstract: A partir de campanas de investigacion del INIDEP, llevadas a cabo en el Golfo San Jorge, Mar Argentino, durante los anos 2001 y 2002, se realizo un examen macroscopico de los ejemplares de centolla Lithodes santolla capturados, con la finalidad de determinar aquellos caracteres cualitativos y cuantitativos que pudieran relacionarse con el envejecimiento del exoesqueleto. Los principales caracteres considerados fueron: dureza del exoesqueleto, color del exoesqueleto ventral, desarrollo de necrosis ventrales, contenido de carne en el mero, tipo de epibiosis, longitud de abrasiones en las coxas, y peso respecto de la talla. A partir de los caracteres cualitativos se realizo un agrupamiento jerarquico, estableciendo asociaciones entre los mismos. De esta manera, se elaboro una clave que permitio discriminar a los ejemplares en distintos grupos. Paralelamente, se realizo un analisis multivariado de los caracteres cuantitativos considerados, evaluando su correspondencia con los grupos establecidos cualitativamente. Las asociaciones establecidas entre los caracteres cualitativos y cuantitativos permitieron definir diferentes grupos o 'condiciones de exoesqueleto'. Entre estos grupos, se establecio una relacion cronologica, y se asigno una edad tentativa a cada una ellos. Estos estudios permitiran orientar las investigaciones de la dinamica poblacional hacia el analisis de la variacion espacio-temporal de las 'edades relativas' que componen la estructura de las cohortes, con el objeto de establecer medidas de manejo mas precisas en la pesqueria.
URI: http://hdl.handle.net/1834/4006
Appears in Collections:Tesis En Ciencias Marinas

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